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CogObjectRepresentationFor64BitSpur.class.st
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CogObjectRepresentationFor64BitSpur.class.st
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Class {
#name : #CogObjectRepresentationFor64BitSpur,
#superclass : #CogObjectRepresentationForSpur,
#instVars : [
'ceDereferenceSelectorIndex'
],
#category : #'VMMaker-JIT'
}
{ #category : #accessing }
CogObjectRepresentationFor64BitSpur class >> wordSize [
^8
]
{ #category : #'sista support' }
CogObjectRepresentationFor64BitSpur >> allImmediate: immediateMask branchIf: reg instanceOfBehaviors: arrayObj target: targetFixUp [
| tag1 tag2 |
<var: #targetFixUp type: #'AbstractInstruction *'>
immediateMask = objectMemory tagMask ifTrue: [(self genJumpImmediate: reg) jmpTarget: targetFixUp. ^0].
"TempReg holds the rcvr tag"
"In this case one immediate tag out of the three is not present in arrayObj."
tag1 := objectMemory classTagForClass: (objectMemory fetchPointer: 0 ofObject: arrayObj).
tag2 := objectMemory classTagForClass: (objectMemory fetchPointer: 1 ofObject: arrayObj).
(tag1 = objectMemory smallIntegerTag or: [tag2 = objectMemory smallIntegerTag]) ifTrue:
[(self genJumpSmallIntegerInScratchReg: TempReg) jmpTarget: targetFixUp].
(tag1 = objectMemory characterTag or: [tag2 = objectMemory characterTag]) ifTrue:
[(self genJumpCharacterInScratchReg: TempReg) jmpTarget: targetFixUp].
(tag1 = objectMemory smallFloatTag or: [tag2 = objectMemory smallFloatTag]) ifTrue:
[(self genJumpSmallFloatInScratchReg: TempReg) jmpTarget: targetFixUp].
^0
]
{ #category : #'sista support' }
CogObjectRepresentationFor64BitSpur >> allImmediate: immediateMask branchIf: reg notInstanceOfBehaviors: arrayObj target: targetFixUp [
| incorrectTag tag1 tag2 |
<var: #targetFixUp type: #'AbstractInstruction *'>
(self genJumpNotImmediate: reg) jmpTarget: targetFixUp.
immediateMask = objectMemory tagMask ifFalse:
[ "TempReg holds the rcvr tag"
"In this case one immediate tag out of the three is not present in arrayObj.
We look for it, and generate a jump to the fixup if the rcvr tag matches"
tag1 := objectMemory classTagForClass: (objectMemory fetchPointer: 0 ofObject: arrayObj).
tag2 := objectMemory classTagForClass: (objectMemory fetchPointer: 1 ofObject: arrayObj).
incorrectTag := self fetchImmediateTagOtherThanTag1: tag1 tag2: tag2.
cogit CmpCq: incorrectTag R: TempReg.
cogit JumpZero: targetFixUp].
^0
]
{ #category : #'sista support' }
CogObjectRepresentationFor64BitSpur >> allocateCounters: nCounters [
"On Spur allocate the counters on the heap as pinned objects.
Each counter occupies 32-bits. The number of counters can
be derived from the number of slots in the obj."
<inline: true>
| objOop |
objOop := objectMemory allocatePinnedSlots: nCounters + 1 // 2.
^objOop
ifNil: [0]
ifNotNil: [objOop + objectMemory baseHeaderSize]
]
{ #category : #'in-line cacheing' }
CogObjectRepresentationFor64BitSpur >> bitAndByteOffsetOfIsFullBlockBitInto: aBlock [
"This supplies the bitmask for the isFullBlock bit, and the offset of the byte containing
that bit in a CogMethod header to aBlock. We don't have named variables holding this
offset. The following assert tests whether the values are correct by creating a surrogate
on an empty ByteArray, setting the bit, and checking that the expected values are set
in the ByteArray."
self cCode: [] inSmalltalk:
[| m |
m := ByteArray new: 16.
CogBlockMethodSurrogate64 new
at: 0 memory: m headerSize: 8 cogit: nil;
cpicHasMNUCaseOrCMIsFullBlock: true.
self assert: m = #[0 0 0 0 0 0 0 0 16 0 0 0 0 0 0 0 ].
self assert: (m at: objectMemory baseHeaderSize + 1) = 16].
aBlock value: 16 value: objectMemory baseHeaderSize + 1 "zero-relative"
]
{ #category : #'sista support' }
CogObjectRepresentationFor64BitSpur >> branch2CasesIf: reg instanceOfBehaviors: arrayObj target: targetFixUp [
| classObj tag1 tag2 |
< inline: true>
"look for the 2 tags requiring jmps"
0 to: (objectMemory numSlotsOf: arrayObj) - 1 do:
[:i|
classObj := objectMemory fetchPointer: i ofObject: arrayObj.
(objectMemory isImmediateClass: classObj)
ifTrue: [ tag1
ifNil: [tag1 := objectMemory classTagForClass: classObj ]
ifNotNil: [tag2 := objectMemory classTagForClass: classObj ] ] ].
(tag1 = objectMemory smallIntegerTag or: [tag2 = objectMemory smallIntegerTag]) ifTrue:
[(self genJumpSmallIntegerInScratchReg: TempReg) jmpTarget: targetFixUp].
(tag1 = objectMemory characterTag or: [tag2 = objectMemory characterTag]) ifTrue:
[(self genJumpCharacterInScratchReg: TempReg) jmpTarget: targetFixUp].
(tag1 = objectMemory smallFloatTag or: [tag2 = objectMemory smallFloatTag]) ifTrue:
[(self genJumpSmallFloatInScratchReg: TempReg) jmpTarget: targetFixUp].
^ 0
]
{ #category : #'sista support' }
CogObjectRepresentationFor64BitSpur >> branch2CasesIf: reg notInstanceOfBehaviors: arrayObj target: targetFixUp [
"Only 2 immediate type allowed out of the three. Look for the third and jump to target fixup if it's the third.
TempReg currently holds the rcvr tag and the receiver is immediate."
| incorrectTag classObj tag1 tag2 |
< inline: true>
"look for the 2 allowed tags"
0 to: (objectMemory numSlotsOf: arrayObj) - 1 do:
[:i|
classObj := objectMemory fetchPointer: i ofObject: arrayObj.
(objectMemory isImmediateClass: classObj)
ifTrue: [ tag1
ifNil: [tag1 := objectMemory classTagForClass: classObj ]
ifNotNil: [tag2 := objectMemory classTagForClass: classObj ] ] ].
incorrectTag := self fetchImmediateTagOtherThanTag1: tag1 tag2: tag2.
cogit CmpCq: incorrectTag R: TempReg.
cogit JumpZero: targetFixUp.
]
{ #category : #'sista support' }
CogObjectRepresentationFor64BitSpur >> branchIf: reg hasImmediateTag: classIndex target: targetFixUp [
<var: #targetFixUp type: #'AbstractInstruction *'>
| jmpImmediate |
<inline: true>
classIndex = objectMemory smallIntegerTag ifTrue:
[jmpImmediate := self genJumpSmallInteger: reg].
classIndex = objectMemory characterTag ifTrue:
[jmpImmediate := self genJumpCharacter: reg].
classIndex = objectMemory smallFloatTag ifTrue:
[jmpImmediate := self genJumpSmallFloat: reg].
jmpImmediate jmpTarget: targetFixUp
]
{ #category : #'sista support' }
CogObjectRepresentationFor64BitSpur >> branchIf: reg hasNotImmediateTag: classIndex target: targetFixUp [
<var: #targetFixUp type: #'AbstractInstruction *'>
| jmpImmediate |
<inline: true>
classIndex = objectMemory smallIntegerTag ifTrue:
[jmpImmediate := self genJumpNotSmallInteger: reg].
classIndex = objectMemory characterTag ifTrue:
[jmpImmediate := self genJumpNotCharacter: reg].
classIndex = objectMemory smallFloatTag ifTrue:
[jmpImmediate := self genJumpNotSmallFloat: reg].
jmpImmediate jmpTarget: targetFixUp
]
{ #category : #'in-line cacheing' }
CogObjectRepresentationFor64BitSpur >> classForInlineCacheTag: classIndex [
^objectMemory classOrNilAtIndex: classIndex
]
{ #category : #'sista support' }
CogObjectRepresentationFor64BitSpur >> fetchImmediateTagOtherThanTag1: tag1 tag2: tag2 [
"Answers the immediate tag which is not tag1 nor tag2, usually Character."
<inline: true>
(tag1 = objectMemory characterTag or: [ tag2 = objectMemory characterTag ]) ifFalse:
[ ^ objectMemory characterTag ].
(tag1 = objectMemory smallIntegerTag or: [ tag2 = objectMemory smallIntegerTag ]) ifFalse:
[ ^ objectMemory smallIntegerTag ].
^ objectMemory smallFloatTag
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genAddSmallIntegerTagsTo: aRegister [
cogit AddCq: 1 R: aRegister.
^0
]
{ #category : #'primitive generators' }
CogObjectRepresentationFor64BitSpur >> genAlloc64BitPositiveIntegerValue: valueReg into: resultReg scratchReg: scratch1 scratchReg: scratch2 [
<returnTypeC: #'AbstractInstruction *'>
| allocSize newLPIHeader jumpFail |
allocSize := objectMemory baseHeaderSize + objectMemory wordSize.
newLPIHeader := objectMemory
headerForSlots: 1
format: objectMemory firstByteFormat
classIndex: ClassLargePositiveIntegerCompactIndex.
cogit MoveAw: objectMemory freeStartAddress R: resultReg.
cogit LoadEffectiveAddressMw: allocSize r: resultReg R: scratch1.
cogit CmpCq: objectMemory getScavengeThreshold R: scratch1.
jumpFail := cogit JumpAboveOrEqual: 0.
cogit MoveR: scratch1 Aw: objectMemory freeStartAddress.
self genStoreHeader: newLPIHeader intoNewInstance: resultReg using: scratch1.
cogit MoveR: valueReg Mw: objectMemory baseHeaderSize r: resultReg.
^jumpFail
]
{ #category : #'primitive generators' }
CogObjectRepresentationFor64BitSpur >> genAlloc64BitSignedIntegerValue: valueReg into: resultReg scratchReg: scratch1 scratchReg: scratch2 [
<returnTypeC: #'AbstractInstruction *'>
| allocSize newLNIHeader jumpFail jumpNeg |
allocSize := objectMemory baseHeaderSize + objectMemory wordSize.
newLNIHeader := objectMemory
headerForSlots: 1
format: objectMemory firstByteFormat
classIndex: ClassLargeNegativeIntegerCompactIndex.
cogit MoveAw: objectMemory freeStartAddress R: resultReg.
cogit LoadEffectiveAddressMw: allocSize r: resultReg R: scratch1.
cogit CmpCq: objectMemory getScavengeThreshold R: scratch1.
jumpFail := cogit JumpAboveOrEqual: 0.
cogit MoveR: scratch1 Aw: objectMemory freeStartAddress.
cogit MoveCq: newLNIHeader R: scratch1.
cogit CmpCq: 0 R: valueReg.
jumpNeg := cogit JumpLess: 0.
"We can avoid duplicating the large constant and a jump choosing between
the alternatives by incrementing the single constant if positive. The assert
checks that the hack works. Compact code is to be preferred because it is
an uncommon case; usually the value will fit in a SmallInteger."
self assert: (objectMemory headerForSlots: 0 format: 0 classIndex: 1) = 1.
cogit AddCq: ClassLargePositiveIntegerCompactIndex - ClassLargeNegativeIntegerCompactIndex R: scratch1.
jumpNeg jmpTarget:
(cogit MoveR: scratch1 Mw: 0 r: resultReg).
"The old less compact code was
cogit CmpCq: 0 R: valueReg.
jumpNeg := cogit JumpLess: 0.
cogit MoveCq: newLPIHeader R: scratch1.
jumpJoin := cogit Jump: 0.
jumpNeg jmpTarget:
(cogit MoveCq: newLNIHeader R: scratch1).
jumpJoin jmpTarget:
(cogit MoveR: scratch1 Mw: 0 r: resultReg)."
cogit MoveR: valueReg Mw: objectMemory baseHeaderSize r: resultReg.
^jumpFail
]
{ #category : #'primitive generators' }
CogObjectRepresentationFor64BitSpur >> genAllocFloatValue: dpreg into: resultReg scratchReg: scratch1 scratchReg: scratch2 [
"Override to answer a SmallFloat64 if possible."
<returnTypeC: #'AbstractInstruction *'>
| jumpFail jumpNotSF jumpMerge |
<var: #jumpFail type: #'AbstractInstruction *'>
<var: #jumpNotSF type: #'AbstractInstruction *'>
<var: #jumpMerge type: #'AbstractInstruction *'>
cogit MoveRd: dpreg R: resultReg.
jumpNotSF := self genJumpNotSmallFloatValueBits: resultReg scratch: scratch1.
self genConvertBitsToSmallFloatIn: resultReg scratch: scratch1.
jumpMerge := cogit Jump: 0.
jumpNotSF jmpTarget: cogit Label.
jumpFail := super genAllocFloatValue: dpreg into: resultReg scratchReg: scratch1 scratchReg: scratch2.
jumpMerge jmpTarget: cogit Label.
^jumpFail
]
{ #category : #'primitive generators' }
CogObjectRepresentationFor64BitSpur >> genBoxedOrSmallFloat: floatOopReg scratchReg: scratchReg into: destReg [
<returnTypeC: #'AbstractInstruction *'>
<var: #jumpNonSmallFloat type: #'AbstractInstruction *'>
<var: #jumpMerge type: #'AbstractInstruction *'>
<var: #jumpFail type: #'AbstractInstruction *'>
| jumpNonSmallFloat jumpMerge jumpFail |
jumpNonSmallFloat := self genJumpNotSmallFloat: floatOopReg.
"Small float case"
self genGetSmallFloatValueOf: floatOopReg scratch: scratchReg into: destReg.
jumpMerge := cogit Jump: 0.
jumpNonSmallFloat jmpTarget: cogit Label.
jumpFail := super genBoxedOrSmallFloat: floatOopReg scratchReg: scratchReg into: destReg.
jumpMerge jmpTarget: cogit Label.
^ jumpFail
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genClearAndSetSmallIntegerTagsIn: scratchReg [
"Set the SmallInteger tag bits when the tag bits may be filled with garbage."
cogit
AndCq: -1 - objectMemory tagMask R: scratchReg;
OrCq: 1 R: scratchReg.
^0
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genConvertBitsToSmallFloatIn: reg scratch: scratch [
"Convert the in-SmallFloat64-range floating point value in integer register into a tagged SmallFloat64 oop.
c.f. Spur64BitMemoryManager>>smallFloatObjectOf:"
| jumpZero |
<var: #jumpZero type: #'AbstractInstruction *'>
cogit
RotateLeftCq: 1 R: reg;
CmpCq: 1 R: reg.
jumpZero :=
cogit JumpBelowOrEqual: 0.
cogit
SubCq: objectMemory smallFloatExponentOffset << (objectMemory smallFloatMantissaBits + 1) R: reg.
jumpZero jmpTarget:
(cogit LogicalShiftLeftCq: objectMemory numTagBits R: reg).
cogit AddCq: objectMemory smallFloatTag R: reg.
^0
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genConvertCharacterToSmallIntegerInReg: reg [
"Convert the Character in reg to a SmallInteger, assuming
the Character's value is a valid character."
cogit SubCq: objectMemory characterTag - objectMemory smallIntegerTag R: reg
]
{ #category : #'primitive generators' }
CogObjectRepresentationFor64BitSpur >> genConvertDataFormat: formatReg numSlots: slotsRegister intoBytes: destReg [
| jumpIsBytes jumpIsShorts jumpIsLongs jumpLongLongsDone jumpBytesDone jumpShortsDone jumpLongsDone |
slotsRegister ~= destReg ifTrue: [
cogit MoveR: slotsRegister R: destReg.
].
cogit CmpCq: objectMemory firstByteFormat R: formatReg.
jumpIsBytes := cogit JumpAboveOrEqual: 0.
cogit CmpCq: objectMemory firstShortFormat R: formatReg.
jumpIsShorts := cogit JumpAboveOrEqual: 0.
cogit CmpCq: objectMemory firstLongFormat R: formatReg.
jumpIsLongs := cogit JumpAboveOrEqual: 0.
"Long long"
cogit LogicalShiftLeftCq: objectMemory shiftForWord R: destReg.
jumpLongLongsDone := cogit Jump: 0.
"Bytes"
jumpIsBytes jmpTarget:
(cogit LogicalShiftLeftCq: objectMemory shiftForWord R: destReg).
cogit AndCq: objectMemory wordSize - 1 R: formatReg.
cogit SubR: formatReg R: destReg.
jumpBytesDone := cogit Jump: 0.
jumpIsShorts jmpTarget:
(cogit LogicalShiftLeftCq: objectMemory shiftForWord - 1 R: destReg).
cogit AndCq: (objectMemory wordSize >> 1) - 1 R: formatReg.
cogit SubR: formatReg R: destReg.
cogit LogicalShiftLeftCq: 1 R: destReg.
jumpShortsDone := cogit Jump: 0.
jumpIsLongs jmpTarget:
(cogit LogicalShiftLeftCq: objectMemory shiftForWord - 2 R: destReg).
cogit AndCq: (objectMemory wordSize >> 2) - 1 R: formatReg.
cogit SubR: formatReg R: destReg.
cogit LogicalShiftLeftCq: 2 R: destReg.
jumpLongsDone := cogit Jump: 0.
jumpLongLongsDone jmpTarget:
(jumpLongsDone jmpTarget:
(jumpShortsDone jmpTarget:
(jumpBytesDone jmpTarget:
cogit Label))).
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genConvertIntegerToSmallIntegerInReg: reg [
cogit LogicalShiftLeftCq: objectMemory numTagBits R: reg.
cogit AddCq: 1 R: reg.
^0
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genConvertSmallFloatToSmallFloatHashAsIntegerInReg: reg scratch: scratch [
"Convert the SmallFloat in reg to its identityHash as a SmallInteger.
Rotate the sign bit from bit 3 (zero-relative) to the sign bit.
c.f. Spur64BitMemoryManager>>rotatedFloatBitsOf:"
self assert: objectMemory smallFloatTag >> 1 - objectMemory smallIntegerTag = objectMemory smallIntegerTag.
cogit
LogicalShiftRightCq: 1 R: reg;
AndCq: 1 << (objectMemory numTagBits - 1) R: reg R: scratch;
SubR: scratch R: reg;
SubCq: objectMemory smallFloatTag >> 1 - objectMemory smallIntegerTag R: reg;
LogicalShiftLeftCq: 63 - (objectMemory numTagBits - 1) R: scratch;
OrR: scratch R: reg.
^0
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genConvertSmallIntegerToCharacterInReg: reg [
"Convert the SmallInteger in reg to a Character, assuming
the SmallInteger's value is a valid character."
cogit AddCq: objectMemory characterTag - objectMemory smallIntegerTag R: reg
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genConvertSmallIntegerToIntegerInReg: reg [
cogit ArithmeticShiftRightCq: objectMemory numTagBits R: reg.
^0
]
{ #category : #'primitive generators' }
CogObjectRepresentationFor64BitSpur >> genDoubleArithmetic: arithmeticOperator preOpCheck: preOpCheckOrNil [
<inline: true>
^self genFloatArithmetic: arithmeticOperator preOpCheck: preOpCheckOrNil boxed: true
]
{ #category : #'primitive generators' }
CogObjectRepresentationFor64BitSpur >> genDoubleComparison: jumpOpcodeGenerator invert: invertComparison [
<inline: true>
^self genFloatComparison: jumpOpcodeGenerator invert: invertComparison boxed: true
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genFetchIndexRegister: indexReg from: tableObj into: destReg [
"indexReg contains the 1-relative index of an element in tableObj.
Since BaseHeaderSize = BytesPerOop we can use it as a
zero-relative index from the beginning of the object."
self assert: indexReg ~= destReg.
cogit genMoveConstant: tableObj R: destReg.
cogit MoveXwr: indexReg R: destReg R: destReg.
^0
]
{ #category : #'primitive generators' }
CogObjectRepresentationFor64BitSpur >> genFloatArithmetic: arithmeticOperator preOpCheck: preOpCheckOrNil boxed: rcvrBoxed [
<var: #preOpCheckOrNil declareC: 'AbstractInstruction *(*preOpCheckOrNil)(int rcvrReg, int argReg)'>
<inline: false>
| jumpFailAlloc jumpFailCheck jumpImmediate jumpNotSmallFloat jumpNotSmallInteger jumpNotBoxedFloat doOp |
<var: #jumpNotSmallInteger type: #'AbstractInstruction *'>
<var: #jumpNotBoxedFloat type: #'AbstractInstruction *'>
<var: #jumpNotSmallFloat type: #'AbstractInstruction *'>
<var: #jumpImmediate type: #'AbstractInstruction *'>
<var: #jumpFailCheck type: #'AbstractInstruction *'>
<var: #jumpFailAlloc type: #'AbstractInstruction *'>
<var: #doOp type: #'AbstractInstruction *'>
cogit genLoadArgAtDepth: 0 into: Arg0Reg.
rcvrBoxed
ifTrue: [self genGetDoubleValueOf: ReceiverResultReg into: DPFPReg0]
ifFalse: [self genGetSmallFloatValueOf: ReceiverResultReg scratch: TempReg into: DPFPReg0].
jumpNotSmallFloat := self genJumpNotSmallFloat: Arg0Reg.
self genGetSmallFloatValueOf: Arg0Reg scratch: TempReg into: DPFPReg1.
doOp := cogit Label.
preOpCheckOrNil ifNotNil:
[jumpFailCheck := cogit perform: preOpCheckOrNil with: DPFPReg0 with: DPFPReg1].
cogit gen: arithmeticOperator operand: DPFPReg1 operand: DPFPReg0.
jumpFailAlloc := self genAllocFloatValue: DPFPReg0 into: SendNumArgsReg scratchReg: ClassReg scratchReg: TempReg.
cogit MoveR: SendNumArgsReg R: ReceiverResultReg.
cogit genPrimReturn.
jumpNotSmallFloat jmpTarget: cogit Label.
jumpNotSmallInteger := self genJumpNotSmallInteger: Arg0Reg.
cogit MoveR: Arg0Reg R: Arg1Reg.
self genConvertSmallIntegerToIntegerInReg: Arg1Reg.
cogit ConvertR: Arg1Reg Rd: DPFPReg1.
cogit Jump: doOp.
jumpNotSmallInteger jmpTarget: cogit Label.
jumpImmediate := self genJumpImmediate: Arg0Reg.
self genGetCompactClassIndexNonImmOf: Arg0Reg into: SendNumArgsReg.
self genCmpClassFloatCompactIndexR: SendNumArgsReg.
jumpNotBoxedFloat := cogit JumpNonZero: 0.
self genGetDoubleValueOf: Arg0Reg into: DPFPReg1.
cogit Jump: doOp.
jumpImmediate jmpTarget:
(jumpNotBoxedFloat jmpTarget:
(jumpNotSmallInteger jmpTarget:
(jumpFailAlloc jmpTarget: cogit Label))).
preOpCheckOrNil ifNotNil:
[jumpFailCheck jmpTarget: jumpFailAlloc getJmpTarget].
^0
]
{ #category : #'primitive generators' }
CogObjectRepresentationFor64BitSpur >> genFloatComparison: jumpOpcodeGenerator invert: invertComparison boxed: rcvrBoxed [
<var: #jumpOpcodeGenerator declareC: 'AbstractInstruction *(*jumpOpcodeGenerator)(void *)'>
<inline: false>
| jumpImmediate jumpNotSmallFloat jumpNotSmallInteger jumpNotBoxedFloat jumpCond compare |
<var: #jumpNotSmallInteger type: #'AbstractInstruction *'>
<var: #jumpNotBoxedFloat type: #'AbstractInstruction *'>
<var: #jumpNotSmallFloat type: #'AbstractInstruction *'>
<var: #jumpImmediate type: #'AbstractInstruction *'>
<var: #jumpCond type: #'AbstractInstruction *'>
cogit genLoadArgAtDepth: 0 into: Arg0Reg.
rcvrBoxed
ifTrue: [self genGetDoubleValueOf: ReceiverResultReg into: DPFPReg0]
ifFalse: [self genGetSmallFloatValueOf: ReceiverResultReg scratch: TempReg into: DPFPReg0].
jumpNotSmallFloat := self genJumpNotSmallFloat: Arg0Reg.
self genGetSmallFloatValueOf: Arg0Reg scratch: TempReg into: DPFPReg1.
compare := invertComparison "May need to invert for NaNs"
ifTrue: [cogit CmpRd: DPFPReg0 Rd: DPFPReg1]
ifFalse: [cogit CmpRd: DPFPReg1 Rd: DPFPReg0].
jumpCond := cogit perform: jumpOpcodeGenerator with: 0. "FP jumps are a little weird"
cogit genMoveFalseR: ReceiverResultReg.
cogit genPrimReturn.
jumpCond jmpTarget: (cogit genMoveTrueR: ReceiverResultReg).
cogit genPrimReturn.
jumpNotSmallFloat jmpTarget: cogit Label.
jumpNotSmallInteger := self genJumpNotSmallInteger: Arg0Reg.
self genConvertSmallIntegerToIntegerInReg: Arg0Reg.
cogit ConvertR: Arg0Reg Rd: DPFPReg1.
cogit Jump: compare.
jumpNotSmallInteger jmpTarget: cogit Label.
jumpImmediate := self genJumpImmediate: Arg0Reg.
self genGetCompactClassIndexNonImmOf: Arg0Reg into: SendNumArgsReg.
self genCmpClassFloatCompactIndexR: SendNumArgsReg.
jumpNotBoxedFloat := cogit JumpNonZero: 0.
self genGetDoubleValueOf: Arg0Reg into: DPFPReg1.
cogit Jump: compare.
jumpImmediate jmpTarget:
(jumpNotBoxedFloat jmpTarget: cogit Label).
^CompletePrimitive
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genGetHashFieldNonImmOf: instReg asSmallIntegerInto: destReg [
"Fetch the instance's identity hash into destReg, encoded as a SmallInteger."
cogit
MoveMw: 0 r: instReg R: destReg;
"Shift and mask the field leaving room for the SmallInteger tag."
LogicalShiftRightCq: objectMemory identityHashFullWordShift - objectMemory numTagBits R: destReg;
AndCq: objectMemory identityHashHalfWordMask << objectMemory numTagBits R: destReg;
AddCq: objectMemory smallIntegerTag R: destReg.
^0
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genGetHashFieldNonImmOf: instReg into: destReg [
"Fetch the instance's identity hash into destReg, unencoded."
cogit
MoveMw: 0 r: instReg R: destReg;
LogicalShiftRightCq: 32 R: destReg;
AndCq: objectMemory identityHashHalfWordMask R: destReg.
^0
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genGetInlineCacheClassTagFrom: sourceReg into: destReg forEntry: forEntry [
"Extract the inline cache tag for the object in sourceReg into destReg. The inline
cache tag for a given object is the value loaded in inline caches to distinguish
objects of different classes. In Spur this is either the tags for immediates, or
the receiver's classIndex. Answer the label for the start of the sequence."
| jumpImm entryLabel |
<var: #jumpImm type: #'AbstractInstruction *'>
<var: #entryLabel type: #'AbstractInstruction *'>
forEntry ifTrue:
[cogit AlignmentNops: objectMemory wordSize].
entryLabel := cogit Label.
cogit AndCq: objectMemory tagMask R: sourceReg R: destReg.
jumpImm := cogit JumpNonZero: 0.
"Get least significant half of header word in destReg"
self flag: #endianness.
cogit MoveMw: 0 r: sourceReg R: destReg.
cogit AndCq: objectMemory classIndexMask R: destReg.
"The entry and the noCheckEntry (that will generated after) need to be aligned differently.
We do that by forcing some odd number of extra Nop operations here.
One Nop is not enough because that causes x86-64 entries to have the same allignment.
In ARM64 all instructions are 4 byte long, thus 3 Nops make
- the entry to be aligned to 8 bytes and
- the no check entry aligned to 4 bytes.
In x86-64 instruction size is variable, and 3 Nops take 3 bytes."
forEntry ifTrue: [
cogit Nop.
cogit Nop.
cogit Nop.
].
jumpImm jmpTarget: cogit Label.
^entryLabel
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genGetNumBytesOf: srcReg into: destReg [
"Get the size in byte-sized slots of the object in srcReg into destReg.
srcReg may equal destReg.
destReg <- numSlots << self shiftForWord - (fmt bitAnd: 7).
Assumes the object in srcReg has a byte format, i.e. 16 to 23 or 24 to 31 "
<var: #jmp type: #'AbstractInstruction *'>
| jmp |
self genGetRawSlotSizeOfNonImm: srcReg into: destReg.
cogit CmpCq: objectMemory numSlotsMask R: destReg.
jmp := cogit JumpLess: 0.
self genGetOverflowSlotsOf: srcReg into: destReg.
jmp jmpTarget: (cogit LogicalShiftLeftCq: objectMemory shiftForWord R: destReg).
self genGetBits: 7 ofFormatByteOf: srcReg into: TempReg.
"Now: fmt bitAnd: 3 in TempReg"
cogit SubR: TempReg R: destReg.
^0
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genGetOverflowSlotsOf: srcReg into: destReg [
cogit
MoveMw: objectMemory baseHeaderSize negated r: srcReg R: destReg;
LogicalShiftLeftCq: 8 R: destReg;
LogicalShiftRightCq: 8 R: destReg.
^0
]
{ #category : #'primitive generators' }
CogObjectRepresentationFor64BitSpur >> genGetSizeOf: sourceReg into: destReg formatReg: formatReg scratchReg: scratchReg abortJumpsInto: aBinaryBlock [
"Get the size of the non-immediate object in sourceReg into destReg using formatReg
and scratchReg as temps. None of these registers can overlap. Supply the jumps
taken if the object in sourceReg is not indexable, or if the object in sourceReg is a
context.. Hack: If the object has a pointer format other than 2 leave the number of
fixed fields in formatReg. Used by primitiveSize, primitiveAt, and primitiveAtPut"
<returnTypeC: #'AbstractInstruction *'>
| jumpNotIndexable
jumpBytesDone jumpShortsDone jumpArrayDone jump32BitLongsDone jump64BitLongsDone
jumpIsBytes jumpHasFixedFields jumpIsShorts jumpIs32BitLongs jumpIsContext |
"c.f. StackInterpreter>>stSizeOf: SpurMemoryManager>>lengthOf:format: fixedFieldsOf:format:length:"
"formatReg := self formatOf: sourceReg"
self genGetFormatOf: sourceReg
into: formatReg
leastSignificantHalfOfBaseHeaderIntoScratch: scratchReg.
self genGetNumSlotsOf: sourceReg into: destReg.
"dispatch on format in a combination of highest dynamic frequency order first and convenience.
0 = 0 sized objects (UndefinedObject True False et al)
1 = non-indexable objects with inst vars (Point et al)
2 = indexable objects with no inst vars (Array et al)
3 = indexable objects with inst vars (MethodContext AdditionalMethodState et al)
4 = weak indexable objects with inst vars (WeakArray et al)
5 = weak non-indexable objects with inst vars (ephemerons) (Ephemeron)
6 unused, reserved for exotic pointer objects?
7 Forwarded Object, 1st field is pointer, rest of fields are ignored
8 unused, reserved for exotic non-pointer objects?
9 64-bit indexable
10 - 11 32-bit indexable
12 - 15 16-bit indexable
16 - 23 byte indexable
24 - 31 compiled method"
cogit CmpCq: objectMemory firstByteFormat R: formatReg.
jumpIsBytes := cogit JumpGreaterOrEqual: 0.
cogit CmpCq: objectMemory arrayFormat R: formatReg.
jumpArrayDone := cogit JumpZero: 0.
jumpNotIndexable := cogit JumpLess: 0.
cogit CmpCq: objectMemory weakArrayFormat R: formatReg.
jumpHasFixedFields := cogit JumpLessOrEqual: 0.
cogit CmpCq: objectMemory firstShortFormat R: formatReg.
jumpIsShorts := cogit JumpGreaterOrEqual: 0.
cogit CmpCq: objectMemory firstLongFormat R: formatReg.
jumpIs32BitLongs := cogit JumpGreaterOrEqual: 0.
cogit CmpCq: objectMemory sixtyFourBitIndexableFormat R: formatReg.
jump64BitLongsDone := cogit JumpZero: 0.
jumpNotIndexable jmpTarget: cogit Label.
jumpNotIndexable := cogit Jump: 0.
jumpIsBytes jmpTarget:
(cogit LogicalShiftLeftCq: objectMemory shiftForWord R: destReg).
cogit AndCq: objectMemory wordSize - 1 R: formatReg.
cogit SubR: formatReg R: destReg.
jumpBytesDone := cogit Jump: 0.
jumpIsShorts jmpTarget:
(cogit LogicalShiftLeftCq: objectMemory shiftForWord - 1 R: destReg).
cogit AndCq: objectMemory wordSize >> 1 - 1 R: formatReg.
cogit SubR: formatReg R: destReg.
jumpShortsDone := cogit Jump: 0.
jumpIs32BitLongs jmpTarget:
(cogit LogicalShiftLeftCq: objectMemory shiftForWord - 2 R: destReg).
cogit AndCq: objectMemory wordSize >> 2 - 1 R: formatReg.
cogit SubR: formatReg R: destReg.
jump32BitLongsDone := cogit Jump: 0.
"formatReg contains fmt, now up for grabs.
destReg contains numSlots, precious.
sourceReg must be preserved"
jumpHasFixedFields jmpTarget:
(cogit AndCq: objectMemory classIndexMask R: scratchReg).
cogit MoveR: scratchReg R: formatReg.
cogit CmpCq: ClassMethodContextCompactIndex R: scratchReg.
jumpIsContext := cogit JumpZero: 0.
self genGetClassObjectOfClassIndex: formatReg into: Extra0Reg scratchReg: scratchReg.
self genLoadSlot: InstanceSpecificationIndex sourceReg: Extra0Reg destReg: formatReg.
self genConvertSmallIntegerToIntegerInReg: formatReg.
cogit
AndCq: objectMemory fixedFieldsOfClassFormatMask R: formatReg;
SubR: formatReg R: destReg.
jumpArrayDone jmpTarget:
(jump64BitLongsDone jmpTarget:
(jump32BitLongsDone jmpTarget:
(jumpShortsDone jmpTarget:
(jumpBytesDone jmpTarget:
cogit Label)))).
aBinaryBlock value: jumpNotIndexable value: jumpIsContext
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genGetSmallFloatValueOf: oopReg scratch: scratch into: dpReg [
"Convert the SmallFloat oop in ooppReg into the corresponding float value in dpReg.
c.f. Spur64BitMemoryManager>>smallFloatBitsOf:"
| jumpSFZero |
<var: 'jumpSFZero' type: #'AbstractInstruction *'>
cogit
MoveR: oopReg R: scratch;
LogicalShiftRightCq: objectMemory numTagBits R: scratch;
CmpCq: 1 R: scratch.
jumpSFZero := cogit JumpLessOrEqual: 0.
cogit AddCq: objectMemory smallFloatExponentOffset << (objectMemory smallFloatMantissaBits + 1) R: scratch.
jumpSFZero jmpTarget: (cogit RotateRightCq: 1 R: scratch).
cogit MoveR: scratch Rd: dpReg.
^0
]
{ #category : #'primitive generators' }
CogObjectRepresentationFor64BitSpur >> genIntegerTo64BitPositiveIntegerValue: valueReg into: resultReg scratchReg: scratch1 scratchReg: scratch2 [
<var: #jumpFail type: #'AbstractInstruction *'>
<var: #jumpNotSmallInteger type: #'AbstractInstruction *'>
<var: #jumpMerge type: #'AbstractInstruction *'>
| jumpNotSmallInteger jumpMerge jumpFail |
cogit MoveR: valueReg R: scratch1.
cogit LogicalShiftRightCq: self numSmallIntegerBits - 1 R: scratch1. "If in range this is now 0"
(cogit lastOpcode setsConditionCodesFor: JumpZero) ifFalse:
[cogit CmpCq: 0 R: scratch1]. "N.B. FLAGS := ClassReg - 0"
jumpNotSmallInteger := cogit JumpNonZero: 0.
cogit MoveR: valueReg R: resultReg.
self genConvertIntegerToSmallIntegerInReg: resultReg.
jumpMerge := cogit Jump: 0.
jumpNotSmallInteger jmpTarget: cogit Label.
jumpFail := self genAlloc64BitPositiveIntegerValue: valueReg into: resultReg scratchReg: scratch1 scratchReg: scratch2.
jumpMerge jmpTarget: cogit Label.
^ jumpFail.
]
{ #category : #'primitive generators' }
CogObjectRepresentationFor64BitSpur >> genIntegerTo64BitSignedIntegerValue: valueReg into: resultReg scratchReg: scratch1 scratchReg: scratch2 [
<returnTypeC: #'AbstractInstruction *'>
<var: #jumpFail type: #'AbstractInstruction *'>
<var: #jumpNotSmallInteger type: #'AbstractInstruction *'>
<var: #jumpMerge type: #'AbstractInstruction *'>
| jumpNotSmallInteger jumpMerge jumpFail |
cogit MoveR: valueReg R: scratch1.
cogit ArithmeticShiftRightCq: self numSmallIntegerBits R: scratch1. "If in range this is now 0 or -1"
cogit AddCq: 1 R: scratch1.
cogit CmpCq: 1 R: scratch1.
jumpNotSmallInteger := cogit JumpAbove: 0.
cogit MoveR: valueReg R: resultReg.
self genConvertIntegerToSmallIntegerInReg: resultReg.
jumpMerge := cogit Jump: 0.
jumpNotSmallInteger jmpTarget: cogit Label.
jumpFail := self genAlloc64BitSignedIntegerValue: valueReg into: resultReg scratchReg: scratch1 scratchReg: scratch2.
jumpMerge jmpTarget: cogit Label.
^ jumpFail
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genJumpCharacter: reg [
"Generate a compare and branch to test if aRegister contains a Character."
^cogit
TstCq: objectMemory characterTag R: reg;
JumpNonZero: 0
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genJumpCharacterInScratchReg: aRegister [
^self genJumpCharacter: aRegister
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genJumpIsSmallIntegerValue: aRegister scratch: scratchReg [
"Generate a test for aRegister containing an integer value in the SmallInteger range, and a jump if so, answering the jump.
c.f. Spur64BitMemoryManager>>isIntegerValue:"
<returnTypeC: #'AbstractInstruction *'>
^cogit
MoveR: aRegister R: scratchReg;
ArithmeticShiftRightCq: 63 - objectMemory numTagBits R: scratchReg;
AddCq: 1 R: scratchReg;
AndCq: 1 << (objectMemory numTagBits + 1) - 1 R: scratchReg; "sign and top numTags bits must be the same"
CmpCq: 1 R: scratchReg;
JumpLessOrEqual: 0
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genJumpNotCharacter: reg [
"Generate a compare and branch to test if aRegister contains other than a Character."
^cogit
TstCq: objectMemory characterTag R: reg;
JumpZero: 0
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genJumpNotCharacterInScratchReg: reg [
<inline: true>
^self genJumpNotCharacter: reg
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genJumpNotSmallFloat: reg [
"Generate a compare and branch to test if aRegister contains other than a SmallFloat.
Answer the jump."
^cogit
TstCq: objectMemory smallFloatTag R: reg;
JumpZero: 0
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genJumpNotSmallFloatInScratchReg: aRegister [
<inline: true>
^self genJumpNotSmallFloat: aRegister
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genJumpNotSmallFloatValueBits: reg scratch: exponent [
"Generate a test to check that the integer register contains a floating point value within the SmallFloat64 range,
and answer the jump. c.f. Spur64BitMemoryManager>>isSmallFloatValue:"
| jumpFail jumpTest jumpMinExponent jumpMaxExponent jumpZeroMantissa |
<var: #jumpFail type: #'AbstractInstruction *'>
<var: #jumpTest type: #'AbstractInstruction *'>
<var: #jumpMinExponent type: #'AbstractInstruction *'>
<var: #jumpMaxExponent type: #'AbstractInstruction *'>
<var: #jumpZeroMantissa type: #'AbstractInstruction *'>
self flag: 'if we combine the exponent range test with the conversion to tagged representation we test for a zero exponent only once. further, if we extract tags once into a scratch on the input side we test for immediates, SmallInteger and SmallFloat using the same intermediate result. so to do is to move fp arithmetic into the object representations'.
cogit MoveR: reg R: exponent.
true
ifTrue: [cogit
LogicalShiftLeftCq: 1 R: exponent; "drop sign"
LogicalShiftRightCq: objectMemory smallFloatMantissaBits + 1 R: exponent] "shift exponent down"
ifFalse: [cogit
LogicalShiftRightCq: objectMemory smallFloatMantissaBits R: exponent;
AndCq: 16r7FF R: exponent]. "ieee double precision mantissa is 11 bits"
cogit CmpCq: objectMemory smallFloatExponentOffset R: exponent.
jumpMinExponent := cogit JumpLessOrEqual: 0.
cogit CmpCq: 255 + objectMemory smallFloatExponentOffset R: exponent. "SmallFloat exponent is 8 bits"
jumpMaxExponent := cogit JumpLessOrEqual: 0.
jumpFail :=
cogit Jump: 0.
jumpMinExponent jmpTarget:
(cogit TstCq: 1 << objectMemory smallFloatMantissaBits - 1 R: reg). "test mantissa bits"
jumpZeroMantissa := cogit JumpZero: 0.
cogit CmpCq: objectMemory smallFloatExponentOffset R: exponent.
jumpTest :=
cogit Jump: 0.
jumpZeroMantissa jmpTarget:
(cogit CmpCq: 0 R: exponent).
jumpTest jmpTarget:
(cogit JumpNonZero: jumpFail).
jumpMaxExponent jmpTarget: cogit Label.
^jumpFail
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genJumpNotSmallInteger: reg [
"Generate a compare and branch to test if aRegister contains other than a SmallInteger."
^cogit
TstCq: objectMemory smallIntegerTag R: reg;
JumpZero: 0
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genJumpNotSmallIntegerInScratchReg: aRegister [
<inline: true>
^self genJumpNotSmallInteger: aRegister
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genJumpNotSmallIntegerValue: aRegister scratch: scratchReg [
"Generate a test for aRegister containing an integer value outside the SmallInteger range, and a jump if so, answering the jump.
c.f. Spur64BitMemoryManager>>isIntegerValue:"
<returnTypeC: #'AbstractInstruction *'>
^cogit
MoveR: aRegister R: scratchReg;
ArithmeticShiftRightCq: 63 - objectMemory numTagBits R: scratchReg;
AddCq: 1 R: scratchReg;
AndCq: 1 << (objectMemory numTagBits + 1) - 1 R: scratchReg; "sign and top numTags bits must be the same"
CmpCq: 1 R: scratchReg;
JumpGreater: 0
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genJumpSmallFloat: aRegister [
"Generate a compare and branch to test if aRegister contains a SmallFloat.
Answer the jump, or UnimplementedOperation if this cannot be done with
a single register."
^cogit
TstCq: objectMemory smallFloatTag R: aRegister;
JumpNonZero: 0
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genJumpSmallFloatInScratchReg: aRegister [
^self genJumpSmallFloat: aRegister
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genJumpSmallInteger: aRegister [
"Generate a compare and branch to test if aRegister contains a SmallInteger.
Answer the jump, or UnimplementedOperation if this cannot be done with
a single register."
^cogit
TstCq: objectMemory smallIntegerTag R: aRegister;
JumpNonZero: 0
]
{ #category : #'compile abstract instructions' }
CogObjectRepresentationFor64BitSpur >> genJumpSmallIntegerInScratchReg: aRegister [
^self genJumpSmallInteger: aRegister
]
{ #category : #'primitive generators' }
CogObjectRepresentationFor64BitSpur >> genPrimitiveAtPutSigned: signedVersion [
"Generate the code for primitives 61 & 165, at:put:/basicAt:put: & integerAt:put:. If signedVersion is true
then generate signed accesses to the bits classes (a la 164 & 165). If signedVersion is false,
generate unsigned accesses (a la 60, 61, 63 & 64)."
| formatReg nSlotsOrBytesReg methodInBounds
jumpImmediate jumpBadIndex jumpImmutable jumpNotIndexablePointers jumpNotIndexableBits
jumpIsContext jumpIsCompiledMethod jumpIsBytes jumpIsShorts jumpIsWords jumpHasFixedFields
jumpArrayOutOfBounds jumpFixedFieldsOutOfBounds
jumpWordsOutOfBounds jumpShortsOutOfBounds jumpBytesOutOfBounds
jumpShortsOutOfRange jumpWordsOutOfRange jumpBytesOutOfRange jumpDoubleWordsOutOfRange
jumpNonSmallIntegerValue jumpNotPointers
rejoin jumpNegative jump64BitsOutOfBounds jumpNot64BitIndexable jump64BitArgIsImmediate jumpNot8ByteInteger
|
"c.f. StackInterpreter>>stSizeOf: SpurMemoryManager>>lengthOf:format: fixedFieldsOf:format:length:"
nSlotsOrBytesReg := ClassReg.
cogit genLoadArgAtDepth: 1 into: Arg0Reg.
cogit genLoadArgAtDepth: 0 into: Arg1Reg.
jumpImmediate := self genJumpImmediate: ReceiverResultReg.
jumpBadIndex := self genJumpNotSmallInteger: Arg0Reg scratchReg: TempReg.
self genConvertSmallIntegerToIntegerInReg: Arg0Reg.
cogit SubCq: 1 R: Arg0Reg. "1-rel => 0-rel"
"formatReg := self formatOf: ReceiverResultReg"
self cppIf: IMMUTABILITY
ifTrue:
[ self genGetFormatOf: ReceiverResultReg
into: (formatReg := SendNumArgsReg)
leastSignificantHalfOfBaseHeaderIntoScratch: TempReg.
jumpImmutable := self genJumpBaseHeaderImmutable: TempReg ]
ifFalse:
[ self genGetFormatOf: ReceiverResultReg
into: (formatReg := SendNumArgsReg)
leastSignificantHalfOfBaseHeaderIntoScratch: NoReg ].
self genGetNumSlotsOf: ReceiverResultReg into: nSlotsOrBytesReg.
"dispatch on format in a combination of highest dynamic frequency order first and convenience.
0 = 0 sized objects (UndefinedObject True False et al)
1 = non-indexable objects with inst vars (Point et al)
2 = indexable objects with no inst vars (Array et al)
3 = indexable objects with inst vars (MethodContext AdditionalMethodState et al)
4 = weak indexable objects with inst vars (WeakArray et al)
5 = weak non-indexable objects with inst vars (ephemerons) (Ephemeron)
6 unused, reserved for exotic pointer objects?
7 Forwarded Object, 1st field is pointer, rest of fields are ignored
8 unused, reserved for exotic non-pointer objects?
9 64-bit indexable
10 - 11 32-bit indexable
12 - 15 16-bit indexable
16 - 23 byte indexable
24 - 31 compiled method"
cogit CmpCq: objectMemory weakArrayFormat R: formatReg.
jumpNotPointers := cogit JumpAbove: 0.
"optimistic store check; assume index in range (almost always is)."
self genStoreCheckReceiverReg: ReceiverResultReg
valueReg: Arg1Reg
scratchReg: TempReg
inFrame: false.
cogit CmpCq: objectMemory arrayFormat R: formatReg.
jumpNotIndexablePointers := cogit JumpBelow: 0.
jumpHasFixedFields := cogit JumpNonZero: 0.
cogit CmpR: Arg0Reg R: nSlotsOrBytesReg.
jumpArrayOutOfBounds := cogit JumpBelowOrEqual: 0.
cogit AddCq: objectMemory baseHeaderSize >> objectMemory shiftForWord R: Arg0Reg.
cogit MoveR: Arg1Reg Xwr: Arg0Reg R: ReceiverResultReg.
cogit MoveR: Arg1Reg R: ReceiverResultReg.
cogit genPrimReturn.
jumpHasFixedFields jmpTarget: cogit Label.
self genGetClassIndexOfNonImm: ReceiverResultReg into: formatReg.
cogit CmpCq: ClassMethodContextCompactIndex R: formatReg.
jumpIsContext := cogit JumpZero: 0.
"get # fixed fields in formatReg"
self genGetClassObjectOfClassIndex: formatReg into: Extra0Reg scratchReg: TempReg.
self genLoadSlot: InstanceSpecificationIndex sourceReg: Extra0Reg destReg: formatReg.
self genConvertSmallIntegerToIntegerInReg: formatReg.
cogit AndCq: objectMemory fixedFieldsOfClassFormatMask R: formatReg.
cogit SubR: formatReg R: nSlotsOrBytesReg.
cogit AddCq: objectMemory baseHeaderSize >> objectMemory shiftForWord R: formatReg.
cogit CmpR: Arg0Reg R: nSlotsOrBytesReg.
jumpFixedFieldsOutOfBounds := cogit JumpBelowOrEqual: 0.
cogit AddR: formatReg R: Arg0Reg.
cogit MoveR: Arg1Reg Xwr: Arg0Reg R: ReceiverResultReg.
cogit MoveR: Arg1Reg R: ReceiverResultReg.
cogit genPrimReturn.
jumpNotPointers jmpTarget: cogit Label.
jumpNonSmallIntegerValue := self genJumpNotSmallInteger: Arg1Reg scratchReg: TempReg.
cogit CmpCq: objectMemory firstByteFormat R: formatReg.
jumpIsBytes := cogit JumpAboveOrEqual: 0.
cogit CmpCq: objectMemory firstShortFormat R: formatReg.
jumpIsShorts := cogit JumpAboveOrEqual: 0.
cogit CmpCq: objectMemory firstLongFormat R: formatReg.
jumpIsWords := cogit JumpAboveOrEqual: 0.
cogit CmpCq: objectMemory sixtyFourBitIndexableFormat R: formatReg.